| 研究課題/領域番号 |
21K09963
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分57040:口腔再生医学および歯科医用工学関連
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| 研究機関 | 早稲田大学 |
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研究代表者 |
国吉 ニルソン 早稲田大学, 理工学術院, 教授 (30254577)
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| 研究分担者 |
ハラ エミリオ・サトシ 岡山大学, 医歯薬学域, 研究准教授 (40779443)
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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| 研究課題ステータス |
完了 (2023年度)
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| 配分額 *注記 |
3,900千円 (直接経費: 3,000千円、間接経費: 900千円)
2023年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
2022年度: 1,560千円 (直接経費: 1,200千円、間接経費: 360千円)
2021年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
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| キーワード | mineralization process / quantum chemistry / reaction dynamics / reaction mechanisms / mineralization mechanism / mineralization / phospholipids / activation energies / reaction mechanism / リン脂質 / 石灰化 / 骨再生 / in vitro実験 / 量子化学計算 |
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| 研究開始時の研究の概要 |
In this research, first the mechanism of mineralization of known (naturally occurring) phospholipids will be investigated in detail through experiments and computational chemistry methods. The origin of differences in mineralization ability of different phospholipids will be identified, and the mineralization mechanism elucidated. Then, novel molecules that can mineralize faster than the phospholipids investigated experimentally will be designed and synthesized. Finally, the mineralization ability of the designed novel molecules will be verified in vitro and in vivo.
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| 研究実績の概要 |
In order to elucidate the mineralization mechanism of phospholipids, we assumed that their hydrolysis reactions are the first step in the process. The reaction dynamics of hydrolysis was analyzed via quantum chemical calculations conducted using Gaussian16 at the B3LYP/6-31G(d,p) level. Phospholipids containing 6 carbon atoms in the hydrophobic tail, and choline (PC6) or serine (PS6) as the hydrophilic head were considered in the simulations. In the 2023 academic year, complexes composed of two phospholipid molecules surrounding a Ca ion (2PC6Ca or 2PS6Ca) were taken as the reactants. The elementary steps involved in the hydrolysis of these complexes were identified, and the free energies of reactants, transition states and products were determined after re-evaluation of the energy of the stationary points at the APFD/6-311+G(2d,p) level. From the values of activation energy and heat release, the sequence through which the elementary steps proceed was determined, and important aspects of the hydrolysis mechanism were identified. Significant differences between the hydrolysis of 2PC6Ca and 2PS6Ca were found, and we conclude that these differences are related to the differences in the mineralization rates of phosphatidylcholine and phosphatidylserine that have been observed experimentally.
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